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Workflow is an important enabling technology for eScience. Research into workflow systems for eScience has yielded several specialized workflow engines. We have been investigating the nature of scientific workflow and experimenting with the BizTalk business integration server to support scientific workflows. In particular we have built a simple web portal for bioinformatics which uses Biztalk as the underlying workflow engine. The portal has a novel web based interface making it accessible to a wide variety of users. In this presentation we will describe the overall system and demonstrate some simple workflows.